Mathias a220fcaf2b feat(routing): create GitHub destination repo before configuring push-mirror ...

Gitea's push-mirror cannot push to a non-existent remote — it just
runs 'git push' against whatever URL it's given. So a project_create
flow that only configures the mirror leaves the GitHub side as an
unfulfillable URL.

New internal/githubclient package: single-purpose client that POSTs
/user/repos to create an empty private repo (auto_init=false so the
first mirror push doesn't conflict with a generated README). Treats
422 'name already exists' as idempotent success via ErrAlreadyExists.
401/403 are surfaced as 'PAT missing repo scope or invalid' so the
operator sees the real cause instead of a vague upstream error.

Skill wiring:
- New stepCreateGitHub between stepCreateRepo and stepMirror in the
  orchestrator.
- Skipped entirely when Config.GitHub is nil (degraded mode — the
  routing pod runs without GITHUB_PAT, mirror config still lands,
  but the actual sync to github fails until the repo exists).
- cmd/routing/main.go constructs githubclient.New(GitHubPAT) only
  when the PAT is set; the skill receives nil otherwise.

Tests:
- happy path: fake github 201 + assertions that the 'reached' array
  is [create_repo, create_github_repo, mirror, infra_commit, issue].
- github 422 already-exists: idempotent, all gitea steps still run.
- github 401: returns failed_step=create_github_repo, no mirror or
  later steps.
- degraded mode (Config.GitHub nil): reached omits create_github_repo,
  rest of the flow runs unchanged.

Updated existing tests to read [skill, gh] from newSkill instead of
just skill, and adjusted reached-array expectations to include the
new step.

Tracks #10.

2026-05-18 13:42:03 +02:00

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